Published in
American Physical Society, Physical Review B (Condensed Matter), 10(65), 2002
DOI: 10.1103/physrevb.65.104438
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AC-driven quantum spins: resonant enhancement of transverse DC magnetization
,
Miroshnichenko Ae,
A. A. Ovchinnikov,
Ovchinnikov Aa
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Abstract
We consider s=1/2 spins in the presence of a constant magnetic field in z-direction and an AC magnetic field in the x-z plane. A nonzero DC magnetization component in y direction is a result of broken symmetries. A pairwise interaction between two spins is shown to resonantly increase the induced magnetization by one order of magnitude. We discuss the mechanism of this enhancement, which is due to additional avoided crossings in the level structure of the system. ; Comment: 7 pages, 7 figures